The time it takes to set up a concert stage depends on the size and complexity of the stage and other factors such as equipment, lighting, and sound. In general, it will take a production crew an average of 8 hours to set up a basic stage for an indoor or outdoor concert, including loading in the equipment, rigging, and audio and lighting set up.
For a more complex stage with larger equipment and additional sound and lighting requirements, that time frame can increase to 10-12 hours or longer. Additionally, there may be additional time needed for setting up special effects, pyrotechnics, or theater seating, which can add to the total set up time.
Of course, in some cases a larger crew can help to speed up the process. Ultimately, it will depend on the individual concert set up requirements.